Lecturer in Microbiology, 1976-77, Kasturba Medical College, Manipal, Karnataka; Senior Resident, 1977-80, Department of Microbiology, JIPMER, Pondicherry; Assistant Professor of Microbiology, 1982-92; Associate Professor of Microbiology, 1992-2000; Professor and Head, Department of Microbiology, 2000-2014, and Associate Director of Research, Karnataka Veterinary, Animal & Fisheries Sciences University, Mangalore, Karnataka, 2012-14. Member, International Jury for UNESCO prize for Research in Life Sciences; Member, Board of Management, Central Institute of Fisheries Education; Member, Subcommittee on Food Hygiene and Fish & Fishery products, Food Safety & Standards Authority of India; Member, Task Force for Centre of Excellence in the area of Aquaculture and Marine Biotechnology, DBT, Government of India; Member, International Foundation of Science, Sweden; Member of the QRT, CIBA; Faculty, International Life Science Institute, Singapore and Faculty, National Academy of Science, USA; Served several national and international Committees including FAO/WHO Joint Expert Committee on Microbiological Risk Assessment (JEMRA), FAO Expert Committee on Fish Health and Quarantine, WHO committee of Water management in shellfish harvesting areas, Task Forces of Ministry of Science and Technology, Indian Council of Agricultural Research, Review Committees of National Institutes and Research Advisory Committees of Central Institutes; Member, Several Academic and Research Advisory Councils; Editor, Aquaculture and Biotechnology, Science Publisher, USA; Editor, Marine Biotechnology-EOLSS-Encyclopedia.

Lecturer in Microbiology, 1976-77, Kasturba Medical College, Manipal, Karnataka; Senior Resident, 1977-80, Department of Microbiology, JIPMER, Pondicherry; Assistant Professor of Microbiology, 1982-92; Associate Professor of Microbiology, 1992-2000; Professor and Head, Department of Microbiology, 2000-2014, and Associate Director of Research, Karnataka Veterinary, Animal & Fisheries Sciences University, Mangalore, Karnataka, 2012-14. Member, International Jury for UNESCO prize for Research in Life Sciences; Member, Board of Management, Central Institute of Fisheries Education; Member, Subcommittee on Food Hygiene and Fish & Fishery products, Food Safety & Standards Authority of India; Member, Task Force for Centre of Excellence in the area of Aquaculture and Marine Biotechnology, DBT, Government of India; Member, International Foundation of Science, Sweden; Member of the QRT, CIBA; Faculty, International Life Science Institute, Singapore and Faculty, National Academy of Science, USA; Served several national and international Committees including FAO/WHO Joint Expert Committee on Microbiological Risk Assessment (JEMRA), FAO Expert Committee on Fish Health and Quarantine, WHO committee of Water management in shellfish harvesting areas, Task Forces of Ministry of Science and Technology, Indian Council of Agricultural Research, Review Committees of National Institutes and Research Advisory Committees of Central Institutes; Member, Several Academic and Research Advisory Councils; Editor, Aquaculture and Biotechnology, Science Publisher, USA; Editor, Marine Biotechnology-EOLSS-Encyclopedia.